Avision FB2100_Green (BF-0505) - Manual (Page 8)

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1.3 UNLOCKING THE SCANNING UNIT
The scanner is designed with a lock switch to protect the scanning
unit from damage during shipment. Before using the scanner,
you must unlock the scanning unit. To unlock the scanning unit,
locate the lock switch at the rear of the scanner. Move the lock
switch to the “unlocked position” as shown below.
Warning:
1. Using the scanner without unlocking the scanning unit will
cause damage to the machine and void the warranty.
2. To transport the machine, you must lock the scanning unit
before transporting to other locations.